Printer Cutter Apparatus Dual Movable Blade Gap Control
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Solution Overview
Problem
Conventional cutter apparatuses for printers often result in incomplete cuts due to uneven pressure distribution and friction between movable blades, leading to paper jams and poor print quality.
Innovation Solution
A cutter apparatus with a fixed blade and two movable blades, where the gap between the blades is maintained by urging members to ensure a narrow, consistent cutting edge contact, preventing blade interference and ensuring a full cut without producing undesirable paper flakes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single movable blade with V-shape cutting edge is used, then the structure is simple, but the contact pressure at both sides becomes uneven leading to cut failure
Solution Approach 1:
The single movable blade is divided into two separate movable blades (first movable blade and second movable blade). Each blade independently contacts the fixed blade at one point, eliminating the pressure distribution problem of the V-shape design while achieving precise cutting through independent pressure control.
2Manufacturing precision
If two movable blades touch each other at the center, then the cutting edge contact is improved, but friction force increases reducing contact pressure
Solution Approach 1:
The contact between the two movable blades at the center is eliminated by introducing a gap. This removes the source of friction force that was reducing contact pressure, allowing each blade to maintain optimal contact pressure with the fixed blade without interference from the other blade.
3Manufacturing precision
If the movable blades are moved close to each other, then the gap is reduced for better cutting, but the blades may touch and generate friction
Solution Approach 1:
A gap is introduced as an intermediary space between the first movable blade and the second movable blade. This gap prevents direct contact and friction between the blades while maintaining a narrow spacing that ensures precise cutting performance.
4Reliability
If pressure is increased to ensure full cut, then cutting reliability improves, but blade wear increases shortening lifetime
Solution Approach 1:
By dividing the cutting action into two separate contact points (one for each movable blade), the required pressure for successful cutting is distributed. Each blade operates at lower, more sustainable pressure levels, reducing wear while maintaining reliable cutting performance through the coordinated action of both blades.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a sure full cut without paper flakes, preventing paper jams and improving print quality by maintaining consistent pressure and reducing friction between blades.
Implementation Method 1
a gap between the first movable blade (21) and the second movable blade (22) is provided in such manner that the gap is maintained to have a desired gap width by an urging member
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A printer (9) and a cutter apparatus (1) configured to provide a sure full cut without producing an undesirable flake of paper. The cutter apparatus (1)comprises a fixed blade (11), a first movable blade (21) disposed on one side in a width direction of the paper and configured to move back and forth with respect to the fixed blade, a second movable blade (22) disposed on the other side in the width direction of the paper with a gap (S) provided with respect to the first movable blade and configured to move back and forth with respect to the fixed blade (11), and an urging member (33, 36) configured to urge each of the first movable blade (21) and the second movable blade (22) in a direction reducing the gap (S).